Powdery preparations containing diethylamino-hydroxybenzoyl-hexyl-benzoate

Abstract

The invention relates to a method of producing powdered preparations comprising diethylamino hydroxybenzoly hexyl benzoate of formula I the method comprising: a) dispersing the benzoyl benzoate of formula I in an aqueous molecularly disperse or colloidally disperse solution of a protective colloid and b) converting the dispersion obtained into a dry powder by removing the water and and drying, wherein the protective colloid used in process step a) is modified starch.

1 . A method of producing a powdered preparation comprising diethylamino hydroxybenzoyl hexyl benzoate of formula I  
     
       
         
         
             
             
         
       
     
     the method comprising: 
 a) dispersing the benzoyl benzoate of formula I in an aqueous molecularly disperse or colloidally disperse solution of a protective colloid; and  
 b) converting the dispersion obtained into a dry powder by removing the water and drying,  
 wherein the protective colloid used in process step a) is modified starch.  
 
   
   
       2 . The method according to  claim 1 , wherein the dispersion in stage a) comprises the following steps: 
 a 1 ) dissolving the benzoyl benzoate of formula I in one or more water-miscible organic solvent(s) or in a mixture of water and one or more water-miscible organic solvent(s) or    a 2 ) dissolving the benzoyl benzoate of formula I in one or more water-immiscible organic solvent(s) and    a 3 ) mixing the solution obtained after a 1 ) or a 2 ) with an aqueous molecularly disperse or colloidally disperse solution of modified starch, where the hydrophobic phase of the benzoyl benzoate of formula I is formed as nanodisperse phase.    
   
   
       3 . The method according to  claim 1 , wherein the drying in process step b) is conducted in the presence of a coating material.  
   
   
       4 . The method according to  claim 1 , wherein the dispersing of the benzoyl benzoate of formula I in an aqueous molecularly disperse or colloidally disperse solution includes a preparation of a suspension with the modified starch.  
   
   
       5 . The method according to  claim 4 , further comprising grinding the suspension prior to conversion into a dry powder.  
   
   
       6 . The method according to  claim 4 , wherein 
 a 1 ) the benzoyl benzoate of formula I is dissolved in acetone or isopropanol, a mixture of water and acetone, or water and isopropanol at temperatures from 50 to 240° C.,    a 3 ) the solution obtained is mixed with an aqueous molecularly disperse or colloidally disperse solution of modified starch at temperatures from 25 to 120° C. and    b) the suspension formed is spray-dried after removing the organic solvent.    
   
   
       7 . The method according to  claim 1 , wherein the dispersing of the benzoyl benzoate of formula I in an aqueous molecularly disperse or colloidally disperse solution includes a preparation of an emulsion with the modified starch.  
   
   
       8 . The method according to  claim 1 , wherein the protective colloid used is ocetenyl succinate starch.  
   
   
       9 . A powdered preparation containing diethylamino hydroxybenzoyl hexyl benzoate, obtainable by a method according to  claim 1 .  
   
   
       10 . The preparation according to  claim 9  with a content of benzoyl benzoate I of from 0.1 to 70% by weight.  
   
   
       11 . The use of the benzoyl-benzoate-containing powder defined according to  claim 9  as a photostable UV filter in cosmetic and dermatological preparations.  
   
   
       12 . The method according to  claim 1 , wherein the molecularly disperse or colloidally disperse solution includes one or more organic solvents, which are removed in the conversion to the dry powder.  
   
   
       13 . The method according to  claim 4 , wherein the protective colloid used is octenyl succinate starch.  
   
   
       14 . The method according to  claim 7 , wherein the protective colloid used is octenyl succinate starch.  
   
   
       15 . A powdered preparation containing diethylamino hydroxybenzoyl hexyl benzoate, obtainable by a method according to  claim 4 .  
   
   
       16 . A powdered preparation containing diethylamino hydroxybenzoyl hexyl benzoate, obtainable by a method according to  claim 7 .  
   
   
       17 . A powdered preparation comprising diethylamino hydroxybenzoyl hexyl benzoate of formula I  
     
       
         
         
             
             
         
       
     
     the preparation prepared by a process comprising: 
 a) dispersing the benzoyl benzoate of formula I in an aqueous molecularly disperse or colloidally disperse solution of a protective colloid; and  
 b) converting the dispersion obtained into a dry powder by removing the water and drying,  
 wherein the powdered preparation is used as a photostable UV filter in a dermatological preparation.  
 
   
   
       18 . The preparation according to  claim 17 , wherein the powdered preparation is present from 5% to 25% by weight in the dermatological preparation, based on the dry weight of the dermatological preparation.  
   
   
       19 . The method according to  claim 2 , wherein the average particle size of the nanodisperse phase is from 0.05 μm to 20 μm.  
   
   
       20 . The preparation according to  claim 18 , wherein the molecularly disperse or colloidally disperse solution includes a hydrophobic phase of the benzoyl benzoate of formula I as a nanodisperse phase, wherein the average particle size of the nanodisperse phase is from 0.05 μm to 20 μm.